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Tallest High Back Booster - help please! 2016 4-runner

Hi - I am in search of the tallest (at shoulder belt guide) high back booster on the market. I'd love to be able to find a chart detailing this measurement with the various seats that are available on the market, but so far, i haven't been able to.

I have a 2016 Toyota 4-runner and currently use two Britax Frontier ClickTight (2015/2016) seats in the outboard positions in the backseat. The Frontier does NOT work for us as a booster, so I need to replace it for my eldest child. The vehicle belt is slipping out of the shoulder belt positioner and isn't allowing retraction of the vehicle belt when the child shifts in her seat....

Child stats: 53" tall, 20" from seat to top of shoulder, 61lbs.

Budget: any

Other concerns:It doesn't matter how heavy this booster is, or anything like that. It will be in one vehicle. Never moved. Comfort is important however. We don't drive often in town, but we do take 5 two-thousand mile car trips per year.

I realize she could use a backless booster, but we'd prefer the high back booster until they no longer fit her properly.

Can anyone help me???? I've heard there are high back boosters that measure 23" at the shoulder belt guide, so that is what i'm looking for, unless there are some that go higher?

Thank you for helping me brainstorm and search for the booster that will be best!

Re: Tallest High Back Booster - help please! 2016 4-runner

Does age matter when choosing a high back booster?

Here are her physical stats: 53" tall, 20" from seat to top of shoulder, 61lbs.

The Frontier is tall enough, but the vehicle belt isn't working well with the shoulder belt guide in our Britax Frontier ClickTight in Booster mode. This is why I am looking for a new booster. Preferably one that doesn't have any issues with the vehicle belt not retracting properly.

Re: Tallest High Back Booster - help please! 2016 4-runner

The Peg Perego Flex 120 also has a 23” top shoulder guide. I haven’t seen for sure if the new Peg Perego Shuttle Plus also has the same 23” top height but from looking at side-by-side comparison photos, it appears as if it should have the same top height.

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